An Arabidopsis inositol 5-phosphatase gain-of-function alters abscisic acid signaling

被引:33
作者
Burnette, RN
Gunesekera, BM
Gillaspy, GE [1 ]
机构
[1] Virginia Tech, Dept Biochem, Blacksburg, VA 24061 USA
[2] Virginia Tech, Fralin Biotechnol Ctr, Blacksburg, VA 24061 USA
关键词
D O I
10.1104/pp.102.019000
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
Signals can be perceived and amplified at the cell membrane by receptors coupled to the production of a variety of second messengers, including inositol 1,4,5-trisphosphate (IP3). We previously have identified 15 putative inositol 5-phosphatases (5PTases) from Arabidopsis and shown that At5PTase1 can hydrolyze IP3. To determine whether At5PTase1 can terminate IP3-mediated signaling, we analyzed transgenic plants ectopically expressing At5PTase1. Stomata from leaves of At5PTase1 transgenic plants were abscisic acid (ABA) and light insensitive, and ABA induction of genes was delayed. Quantification of IP3 in plants exposed to ABA indicated that ABA induced two IP3 increases in wild-type plants. Both of these IP3 increases were reduced in At5PTase1 transgenic plants, indicating that IP3 may be necessary for stomatal closure and temporal control of ABA-induced gene expression. To determine if ABA could induce expression of At5PTase1, we examined RNA and protein levels of At5PTase1 in wild-type plants exposed to ABA. Our results indicate that At5PTase1 is up-regulated in response to ABA. This is consistent with At5PTase1 acting as a signal terminator of ABA signaling.
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页码:1011 / 1019
页数:9
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